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7 Loops in JavaScript
Let’s surf
The for Statement The while Statement
The do-while Statement Nested Loop
Infinite Loop Jump Statements in JavaScript
Some More Programs
Let’s PLug-in Critical Thinking
State whether these statements are true or false.
1. JavaScript does not support conditional statements. __________
2. We cannot use if statement inside other if statement. __________
3. We can check multiple conditions in JavaScript. __________
Sometimes, you need to repeat a task multiple times or you may need to repeat the task either a
certain number of times or until a condition is satisfied. In JavaScript, the statements that are used
to repeat a set of instructions are called iterative or looping statements or simply loops. Loops are
very useful and necessary for developing applications. JavaScript provides three types of loops—for,
while and do-while.
In this chapter, you will learn about loops in JavaScript. Next, you will learn about nested loops in
JavaScript. At the end of this chapter, you will learn about jump statements in JavaScript.
THE FOR STATEMENT
The for statement or loop is used to repeat an instruction or a set of instructions for a fixed number
of times. The syntax to use the for loop is as follows:
for (initialisation_expression; conditional_expression; update_
expression) {
// loop body
}
Loops in JavaScript 97

